State observer for grid-voltage sensorless control of a grid-connected converter equipped with an LCL filter

Kukkola, Jarno; Hinkkanen, Marko

doi:10.1109/epe.2014.6910740

Cited by 7 publications

(9 citation statements)

References 19 publications

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“…Moreover, the degrees of freedom equal those of the methods in [3], [4], but less sensors are needed because of the state observer. The number of the sensors could be further decreased by replacing the grid-voltage measurement with estimation as in [7], [8], [25]- [27].…”

Section: Discussionmentioning

confidence: 99%

Observer-Based State-Space Current Controller for a Grid Converter Equipped With an LCL Filter: Analytical Method for Direct Discrete-Time Design

Kukkola

Hinkkanen

Zenger

2015

IEEE Trans. on Ind. Applicat.

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101

146

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State-space current control enables high dynamic performance of a three-phase grid-connected converter equipped with an LCL filter. In this paper, observer-based state-space control is designed using direct pole placement in the discrete-time domain and in grid-voltage coordinates. Analytical expressions for the controller and observer gains are derived as functions of the physical system parameters and design specifications. The connection between the physical parameters and the control algorithm enables automatic tuning. Parameter sensitivity of the control method is analyzed. The experimental results show that the resonance of the LCL filter is well damped, and the dynamic performance specified by direct pole placement is obtained for the reference tracking and grid-voltage disturbance rejection.

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Section: Discussionmentioning

confidence: 99%

Observer-Based State-Space Current Controller for a Grid Converter Equipped With an LCL Filter: Analytical Method for Direct Discrete-Time Design

Kukkola

Hinkkanen

Zenger

2015

IEEE Trans. on Ind. Applicat.

Self Cite

101

146

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“…The design of the frequency estimator is based on the work developed in [5] which has two parts: (i) a Luenberger observer and (ii) a adaptative controller. The Luenberger observer has the structure represented in Fig.…”

Section: Frequency Estimatormentioning

confidence: 99%

“…Following [5], the mathematical analysis of the observer, together with the linearization to get the transfer function i(s)/ω(s) is explained in Appendix 1. Additionally, the equations to get k p and k i are also detailed.…”

Section: Frequency Estimatormentioning

confidence: 99%

“…One method that was recently studied for grid tied inverters is the development of a state observer to estimate the phase shift and the frequency by an adequate model of the interconnection between the PV inverter and the grid. The study developed by [5] details the observer design for a grid tied inverter with an specific LCL filter for voltage, current and phase shift estimation. Another study was developed in [6] where the observer estimates the phase shift to be used in a PLL and thus the general control is improved.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a State Observer for Frequency Estimation in a Grid Tied Photovoltaic Inverter

Cabrera-Tobar

Gomis‐Bellmunt

Carrasco

et al. 2018

2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Syst

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A phase locked loop (PLL) is commonly used to measure the electrical frequency deviations in PV grid tied inverters. However, this control is affected by sudden changes of power that usually happens with this type of power generation as the solar irradiance is intermittent. Thus, the aim of this paper is to estimate the frequency at the point of common coupling by using a state observer. The evaluation of the observer is developed in DIgSILENT PowerFactory under variable solar irradiance. The results show that the observer gives a more accurate frequency value than a PLL when quick changes of solar irradiance occur.

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“…The most of the applications of grid-connected converters with LCL filter are in the three-phase power systems [1], [2], [3], [4], but only a few of these applications are related to single-phase systems [5]. Control techniques designed for 3-phase systems usually utilize dq decomposition, which is problematic in the singlephase systems (virtual q component).…”

Section: Introductionmentioning

confidence: 99%

Multi-harmonic LQ control of single-phase converter with LCL filter

Bláha

Komrska

Šmı́dl

et al. 2016

2016 International Conference on Applied Electronics (AE)

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Control of single-phase converters connected to the grid via an LCL filter is a demanding issue due to risk of oscillations. A linear-quadratic (LQ) controller enabling besides standard pure sine control also a multiharmonic current reference is proposed in the paper. Such a design enables to control single-phase converters generating harmonic currents, e.g. shunt active filters, or converters operating under distorted voltage conditions. In order to reduce number of sensors, the proposed LQ control has been completed by a state estimator based on the Kalman filter.

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State observer for grid-voltage sensorless control of a grid-connected converter equipped with an LCL filter

Cited by 7 publications

References 19 publications

Observer-Based State-Space Current Controller for a Grid Converter Equipped With an LCL Filter: Analytical Method for Direct Discrete-Time Design

Observer-Based State-Space Current Controller for a Grid Converter Equipped With an LCL Filter: Analytical Method for Direct Discrete-Time Design

Evaluation of a State Observer for Frequency Estimation in a Grid Tied Photovoltaic Inverter

Multi-harmonic LQ control of single-phase converter with LCL filter

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